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Pendo Feedback API vs Postcodes.io

Same instrument, two spec sheets — measured, not claimed.

APIPendo Feedback APIDYING67Postcodes.ioHEALTHY100
Uptime · 30d
Uptime · 90d53.9%100%
Uptime · 30d21.7%100%
P50 · ms51733
P95 · ms812328
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedService MIT-licensed; postcode data license unverified
Free tierFree tier — API key requiredFree — no key required
Rate limitUnpublishedUnpublished (no key; fair use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Pendo Feedback API vs Postcodes.io: common questions

Which is more reliable, Pendo Feedback API or Postcodes.io?

On our scheduled checks, Postcodes.io leads on measured uptime — Pendo Feedback API at 53.9% versus Postcodes.io at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Pendo Feedback API or Postcodes.io?

Postcodes.io has the lower median latency in our checks — Pendo Feedback API responds in 517 ms versus Postcodes.io at 33 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Pendo Feedback API and Postcodes.io need an API key?

Postcodes.io needs no key, while Pendo Feedback API requires a free API key. If you want to start calling without signup, reach for Postcodes.io first.

Can I call Pendo Feedback API and Postcodes.io from the browser?

Only Postcodes.io is browser-friendly — it returns CORS headers over HTTPS. Pendo Feedback API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Pendo Feedback API and Postcodes.io free for commercial use?

Pendo Feedback API has unclear commercial terms, and Postcodes.io has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.